1 / 24

2- Available Conformal Coatings Chemistries and Technologies

2- Available Conformal Coatings Chemistries and Technologies. Introduction. Conformal coating definition Chemistries available: Pros/Cons Technologies available: Pros/Cons. What is a Conformal coating?. Thin plastic protective film

caseyc
Download Presentation

2- Available Conformal Coatings Chemistries and Technologies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 2- Available Conformal Coatings Chemistries and Technologies

  2. Introduction • Conformal coating definition • Chemistries available: Pros/Cons • Technologies available: Pros/Cons

  3. What is a Conformal coating? • Thin plastic protective film • “Conforms” to the varied profile of an electronic circuit assembly. • Membrane that filters water vapour and solid debris • Protects the assembly from corrosion in harsh environments.

  4. What is a Conformal Coating? • Nominally, the coating should be 25µ to 200µ • Too thick may cause problems such as solvent entrapment, bubbling, shrinkage and cracking. • Too thin means inadequate protection

  5. The correct Conformal Coating should provide: • Good dielectric properties • Insulation resistance • Moisture resistance • Breakdown voltage • Good flexibility so as not to stress components... • Chemical resistance against anticipated environment • Good adhesion to substrate • Repairability

  6. Conformal Coating What does it do? • It seals contamination IN AS WELL AS OUT. • Remember, the coating is the last of many chemical processes. • A chemical residue ‘Soup’!. • Do I need to clean? Probably!

  7. Why is Conformal Coating Used? • Extended Warranties on Consumer Electronics • Automotive and Military, Safety Features

  8. Increased demand on coating • Automotive electronics will soon represent 40% of the cost of a car • A great number of safety features are electronically controlled (ABS, Airbag, Servo steering,…)

  9. Main Conformal Coating Chemistries • Acrylic (AR) • Polyurethane (PU) • Silicone (SR)

  10. Acrylic Conformal CoatingsAR • Represent 80% of market • Single component materials • Excellent Moisture resistance • Easy to apply • Cure very quickly • Easy to repair by removal with solvent

  11. Acrylic Conformal CoatingsAR • Especially suitable for: • Any application ‘in a box’ • Boards with long service life • Any environment where water is main threat • Any environment without solvent exposure

  12. Acrylic Conformal CoatingsAR • Examples of use include: • Engine management • Air bag controllers • Avionics • Communication Equipment • Elevator Controls

  13. Polyurethane Conformal CoatingsPU • Very good solvent resistance • 1 and 2K systems • Easy to apply • Longer cure times • Difficult to repair

  14. Polyurethane Conformal CoatingsPU • Especially suitable for: • Salt Spray protection • Applications where solvent resistance required • Directly mounted assemblies • Reparability is not an issue

  15. Silicone Conformal CoatingsSR • Excellent High Temperature Performance • Limited solvent resistance • Solventless Products • Harder to apply • Can be difficult to cure • Nearly impossible to repair • EXPENSIVE

  16. Silicone Conformal CoatingsSR • OVERKILL for all but specialist applications • Used in: • Huge, industrial drilling/mining equipment • High temperature electronics • Under bonnet electronics

  17. Technologies available • Solvent-based • Water-Based • Solvent less Silicones • Solvent less UV Curable

  18. Advantages Full range of chemistries available Easy to process Good wetting ‘Quasi Cleaning’ Fast Cure Disadvantages Flammable Odour Extraction Required VOC Emissions Solvent-Based

  19. Advantages Most similar to solvent-based Full range of chemistries available Low odour Non-flammable Low VOC Disadvantages Longer cure times Hard to apply by robotic equipment More sensitive to contamination Water-Based

  20. Advantages Excellent high temp stability Good flexibility Low VOC Disadvantages Expensive High Viscosity Harder to apply by robotic equipment Thick films required More sensitive to contamination Long cure times Solvent-less Silicones

  21. Solventless UV curable: • Benefits • Very fast curing • High volume processing • High temperature performance • Great flexibility at low temperature • Excellent adhesion and chemical resistance Reliable secondary cure mechanism

  22. Solventless UV curable: • Improve protection of your boards • Reduce floor space • Improve productivity • Reduce solvent consumption • ISO 14001 and other environmental legislation • Safer material to use • Easily processable with automated equipment • Mil-I-46058C & UL approval

  23. Higher number = better properties Summary: Technologies / Chemistries SB = Solvent Based AR = Acrylic PU = Polyurethane WB = Water Based SR = Silicone UV = UV curable

  24. Thank you for your attention! Any questions ? www.humiseal.com europetechsupport@humiseal.com

More Related